Device for gauging the eccentricity and diameter of an annular part



April 3, 1951 w. F. ROSSER 2,547,719 DEVICE FOR swam; THE ECCENTRICITY AND DIAMETER OF AN ANNULAR PART Filed Aug. 3. 1945 v I g" [TIMI 25 \J I I I I 1, I I" ATTORN EY Patented Apr. 3, 1951 DEVICE {FOR GAUGIN AND DIAMETER F William E. Rosser, New Rochelle, N.

G THE ECCENTRIGITY AN ANNULAR PART Y., assignor vto The Sheffield Corporation, Dayton, Ohio, a

corporation of Ohio Application August- 3, 1945, Seflal NOJ608Ji54 4 Claims. 1

'Ihisinvention relates to gauging devices'and more particularly to devices for gauging oncomparing the eccentricity of an annular workpiece.

One objector the invention is the provision of a gauging device having a pair of relatively movable work engagingarms supported on a car- 'rier'and connected to insure equal but opposite movement of'the arms so that the movement of the carrier itself provides an indication :of the eccentricity of the workpiece Another object is the provision of agauging device having means for rotatably supporting an annular workpiece between a pair of Work engaging arms, the arms being mounted for swingingmovement on a movable carrier and so arranged that the motion of the 'allll'SiS in "opposite directions but is equalized to move the carrier .if eccentricity is present in the workpiece.

Another object is the provision of a gauging device of the "character mentioned in which the arms are mounted on the carrier by springblades and are connected to one another by a spring blade to equalize the movements of the arms.

Another object is the provision of :a gauging device of the character mentioned shaving vprovision for also gauging the diameter of the work piece as the workpiece is rotated about its own axis.

Oth r objects and advantages of the invention will be apparent from the following description, the appended claims and the accompanying drawing, in which,

Fig. l is a perspective view of a gauging device embodying the present invention;

Fig. 2 1813, front elevation of the gauging device; and

Fig. 3 is a view showing the connection betweenia switch and indicating lamps.

Referring more particularly to the drawing, in which the same partsare designated by the same reference numerals, i-Q :lndlGEttGS-a suitable supporting structure having an upstanding wall portion to which is fixed a supporting member H that carries the movable portions of the gauging'device. Extending generally parallel 'to supporting member it is a carrier bar 12. -Flalt spaced parallel sprin blades i3 and liars each fixed at one end to the carrier 12 and at the other end to the supporting member H so that the :carrier can move yieldingl-y in the-direction 'ofitsdength. Fixed on the carrier i2 is a block err-lug d5 carrying an adjustable button=or abutmentlfi. The member .lt controls aswitch oper ating plunger W of the switch block it which is H gaging blocks or arms Zliand 2L also-fixed onthe support I D. Theendwise movementof the carrier 12 thus controls the operation of the switch-meansin the switch block, and this switch or switches may be connected to a suitable indicating-means such as a lamp or lamps. The switch means in the switchblock 18 may be of the character :disclosed inAller Patent 2,254,812, granted September '2, 194-1, and control red and'green indicating lamps when the carrier I2 is displaced in one direction -or-the other from a normal position.

Mounted on the carrier l2 are two work err- :The -arm 20 is provided Witha workengaging roller 22 that operates against the periphery of the workpiece 23 whichis'illustrated in the form of raw-pulley wheel. The pulley wheel hasacentral-passage and is fed or supplied by any suitable means to the position in whichit is illustrated andas soon as itis in that'position, amounting stem 24 is raised and-enters thepassage in =the pulley wheel to support the latter for rotation about the axis of the pulley wheel. After a gauging operation is completed, the stem- 24 is lowered and the pulley :is pushed along by another workpiece to be gauged. The upper end of -the-ste m 2 1, in its raised position, isreceived-in a hole 25 in a bracket arm -26 which is fixed with =respect to the support H). U

The arm 2| has a work engaging roller 28 shown with upperand lower roller portions for engagement with the upper and lower flanges of the pulley wheel at a locationdirectly opposite the roller 22.

The'arm-ZG is secured by suitable clamp plates 30-170 fiat spring bladestl and 32 which are'arranged at right angles to one another so as to converge to a theoretical point of support onthe carrier l2. The converging ends of these spring blades are fixed to a bracket -33-on the carrier. These spring blades yieldingly carry the arm for swinging-movements, and-avoidany lost motion that might be present ina pivot connection.

The arm 21 i similarly mounted on the car: rier I2 by fiat spring blades 35 and 36, the arm 2| being mounted for swinging movement about a theoretical axis corresponding to theline where thespr-ing blades intersect. Arm 2| has a bracket 38 which is secured to a straight, flat spring blade 39, the other end of which is fixed to a bracket 4!] on arm 26. An inner portion of arm 20 is thus connected to an outer portion of the arm-2il by spring means avoidinganyipossibuity of lost motion. Thepoints on the arms 20 and 2! to which the spring blade 39 is secured are arranged in line with the axis of the workpiece. The spring blade 39 is thus contained in a common plane with the work axis, and by reason of this spring connection any swinging movement of one of the arms causes an equal but opposite swinging movement of the other arm. The two work engaging rollers '22 and 28 therefore move equally towards one another or away from one another and their movements are equalized with respect to the carrier. Measurement of the movement of one of the arms on the carrier therefore gives a true indication of the diameter of the part. For this purpose there is a switch block 42 fixed on the carrier 52 and having a spring pressed gauging plunger 43 operated by an abutment plate 44 which is preferably close to the plane containing the axes of the rollers 22'and 28. The gauging plunger 43 operates the switch mechanism in the switch block 42 which can control red and green indicating lamps as in Aller Patent 2,254,812.

Fig. 3 shows how the red and green indicating lamps 48 and 49 respectively may be connected to a supply source 58 and to the switch contacts 5|, 52, 53 and 54 of the switch block 42 or of the switch block l8 so as to constitute gauging means to indicate endwise movement of the carrier or the diameter of the workpiece, as the case may be.

When the workpiece is in gauging position, its lower side contacts a rotatable turning wheel 46 which may be turned at a suitable speed by any means such as a drive motor, not shown. As the workpiece or pulley wheel turns on the stem 24, if its diameter is constant, there 'is a constant indication by the switch 42. At the same time any eccentricity of the periphery of the pulley wheel with respect to the central hole in the wheel is indicated by the switch means I8, which is responsive to the endwise movement of the carrier l2. Since the spring pressed plunger 3 holds the gauging rollers 22 and 28 in contact with the pulley wheel, and since the axis of the pulley wheel is fixed with respect to the support, any eccentricity present in the pulley wheel will cause both gauging rollers 22 and 28 to move to the right or to the left. Since the two arms cannot both move in the same direction with respect to the carrier, the carrier itself is moved or shifted endwise, in accordance with the eccentricity present in the workpiece.

The gauging mechanism will operate over long periods of time without wear, since all of the relatively movable parts are interconnected or mounted by means of flexible spring blades, and in view of the entire absence of any lost motion, a very high degree of accuracy is obtained in the gauging operation.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to the precise form shown, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

" What is claimed is:

1. A gauging device for gauging eccentricity of an annular part comprising a work centering means to support the part for rotation about its axis, a pair of work engaging arms, a carrier on which both of said arms are supported for swinging movement towards and from one another, means interconnecting said arms to provide equal but opposite movement of said arms, said means comprising a straight leaf spring fixed at one end to one of the arms and fixed at the other end to the other of said arms and extending radially of the axis of the work centering means, supporting means for said work centering means, means for mounting said carrier on said support for movement in a direction parallel to the direction in which the arms are relatively movable and so that the ends of the arms engage opposite sides of the peripheral portion of a part to be gauged arranged on said centering means, and means for indicating such movement of the carrier.

2. A gauging device for gauging eccentricity of an annular part comprising a pair of work engaging arms, a carrier, leaf springs fixed to the carrier at one end thereof and fixed to the arms at the other end thereof and supporting said arms for swinging movement on the carrier towards and from one another, a leaf spring fixed to both of said arms at opposite ends of the spring and interconnecting said arms to provide equal movement of the arms in a direction towards and from one another, a work centering means rotatably supporting the part to be gauged for movement about the axis of the part and in a position in which the ends of said arms engage opposite sides of the periphery of the part, a fixed support for said work centering means, means mounting said carrier on said support for shifting movement in the same direction as the swinging movement of the work engaging arms, and means for indicating movement of the carrier caused by eccentricity of the part as the part is rotated on the centering means.

3. A gauging device for gauging eccentricity and diameter of an annular part, comprising a pair of work engaging arms, a carrier, spring blades fixed at opposite ends thereof to said arms and to said carrier and mounting both of said arms for swinging movement on the carrier about spaced axes, a work carrying spindle for supporting the part for rotation about the axis of the part, a fixed support for said spindle, spring blades mounting said carrier on said support for movement in a direction perpendicular to the pindle axis and so that the ends of said arms engage opposite sides of the periphery of the part on the spindle, a spring blade interconnecting points on said arms which are in a common plane extending towards the spindle axis to equalize the swinging movement of the arms of the carrier and compelling the ends of the arms that engage the part to move towards one another or away from one another, switch means responsive to movement of the carrier caused by eccentricity of a part rotating on the spindle and switch means mounted on the carrier and responsive to the swinging movement of one of the arms on the carrier for gauging the diameter of the part.

4. A gauging device of the character described comprising a pair of spaced arms adapted for engagement with a part to be gauged, a carrier, spring blades fixed at opposite ends thereof to said arms and to aid carrier and mounting both of said arms for swinging movement on the carrier, a spring blade interconnecting spaced points of said arms and constituting the sole means for equalizing the swinging movement of the arms on the carrier and compelling the ends of the arm to move towards one another or away from one another said blade extendin in line with a point midway between the ends WILLIAM F. ROSSER.

5 REFERENCES CITED The followingreferences are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date Damerell July 10, 1923 Damerell Dec. 5, 1933 Balsiger Feb. 13, 1940 Aller Oct. 8, 1940 Aller Sept. 2, 1941 Alvis July 3, 1945 

